I thought an article called Frank Zappa's not only in it for the money (By Derk Richardson, Bay Guardian, February 2, 1983) would make a nice counterpoint to that talk about the artist as a businessman.
Guess there's not much to it -- it's another piece about Zappa's appreciation of Varèse, with a sort of rote, more-than-slightly-condescending rundown of his career. Still, it's got some good bits and is worth a glance.